[img]http://d.yimg.com/a/p/ap/20100901/capt.89836c55e9894562bd628a0660cb00fa-89836c55e9894562bd628a0660cb00fa-0.jpg?x=86&y=130&q=85&sig=IcKOCVUvbHJ8Pd3nv9fSVA--[/img]AP - The United States has changed commanders in Iraq as the final phase of the American military involvement in the country begins.